<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        .list{
            width: 1000px;
            height: 55px;
            float: left;
            list-style: none;
            text-align: center;
            margin: 10px 150px;
        }
        /* 一级导航 */
        .list li{
            width: 200px;
            line-height: 55px;
            float: left;
            background-color: pink;
            color: white;
        }
        /* 一级导航顶部 */
        .nav{
            display: none;
            list-style: none;
            width: 200px;
            height: 250px;
            line-height: 100px;
        }
        /* 二级导航 */
        .nav li{
            width: 200px;
            height: 50px;
            text-align: center;
            line-height: 50px;
        }
        /* 二级导航的隐藏显示 */
        .list li:hover{
            background-color: darkturquoise;
            color: white;
        }
        /* 一级导航触发 */
        .list li:hover .nav{
            display: block;
        }
        /* 二级导航隐藏触发 */
    </style>
</head>
<body>
    <ul class="list">
        <li>大飞哥花钱
            <ul class="nav">
                <li>大飞哥泡妞</li>
                <li>大飞哥花钱</li>
                <li>大飞哥旅游</li>
                <li>大飞哥犯事</li>
                <li>大飞哥头油</li>
            </ul>
        </li>
        <li>大飞哥图集
            <ul class="nav">
                <li>大飞哥裸照</li>
                <li>大飞哥腿毛</li>
                <li>大飞哥吃饭</li>
                <li>爱吃臭豆腐</li>
                <li>一块不够吃</li>
            </ul>
        </li>
    </ul>
</body>
</html>